women with breast cancer undergoing chemotherapy: implications in quality of life

Conditions: Breast Cancer Female

Summary: breast cancer is a major public health problem and is the main cancer disease in women worldwide and in europe. in portugal it is the most common cancer, the third cause of cancer death, following the european trend. breast cancer (bc) triggers a myriad of physical and psychosocial stressors with repercussions on quality of life (qol). this study is a pioneering randomized controlled trial (rct) in portugal, which seeks to study the impact of a hedonic aroma during chemotherapy on women with breast cancer (3, 6 and 9 weeks, and 3 months after completion of chemotherapy). to this end, participants will be randomly assigned to one of the groups. the experimental group (eg) will be exposed to chemotherapy together with a hedonic aroma, while the control group (cg) will only be exposed to chemotherapy. both groups will be assessed on psychological morbidity, illness perception, self-efficacy for coping, executive function, cortisol levels, side-effects, beliefs about chemotherapy and qol. the aim of this study is to assess the impact of a hedonic aroma on the clinical, emotional and neurocognitive variables that contribute to reducing the side effects of chemotherapy and promoting qol in women with bc.

the sample is non-probabilistic, consisting of 56 participants in the control group (cg) and 56 in the experimental group (eg). according to the calculations made for rct studies (noordzij et al., 2010), it will take approximately a total of 100 participants (50 participants per group) to detect a 10-point difference between the groups in the result variable qol (e.g. eorct qlq-c30), with a population standard deviation of 15.43, according to previous study data (lua et al., 2015), assuming a power of 90% and a significance level of 5%. this study contemplates four moments of evaluation: t1 (baseline: 2nd cycle of ct but before intervention), t2 (6 weeks - 3rd cycle), t3 (9 weeks - 4th cycle) and t4 (3 months after the end of the ct). these moments were chosen taking into account the classes of drugs used in the ct. each cycle has an interval of 21. this is a randomized controlled clinical trial (rct) being single blind (the participant does not know which group he belongs to, only the investigator) and longitudinal. intervention procedure: from the 2nd. chemotherapy cycle (t1), the gc received the standard chemotherapy treatment; while the eg, in addition to the standard chemotherapy treatment, inhaled a hedonic aroma selected at the time of the chemotherapy (among three types of essential oils: bergamot, exotic verbena and geranium). the participant, as she received the ct, would inhale the aroma in a phased manner and under the supervision of the researcher, until the end of the treatment (about two hours). this intervention took place over three cycles of ct (2nd, 3rd and 4th cycles). inhalation was carried out using cotton rolls impregnated with the selected oil, since the more directly the odoriferous molecules are applied to the nose, the greater their impact into the organism (schneider, 2016). however, since it was necessary that the researcher supervised the participants during the inhalation process, the number of times the researcher was in contact with participants from both groups (gc and eg) were the same: 4 times during the chemotherapy treatment to assure the participants from the eg would not have more contacts what could bias the results.

Eligibility criteria:
inclusion criteria: * women with bc in stages 0-2; * level 0-2 on the zubrod scale, * without cognitive impairment, * adjuvant chemotherapy (aq) treatment. exclusion criteria: * severe mental disturbance; * olfactory impairment (≤6), evaluated before ct through the instrument smell diskettes and only in the eg participants

Keywords: quality of life breast cancer essentials oils adjuvant chemotherapy salivary cortisol neuropsychophysiology